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פרק 2 - תנאי שפה
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=== משטח טעון בצפיפות אחידה של מטען חשמלי === נתון משטח הטעון בצפיפות אחידה - <math>\eta_0</math>. אנו יודעים כי השדה החשמלי הינו: <math display="block">\vec E = -\frac{\eta_{0}}{2 \epsilon_0}\cdot \sgn(z) \hat z</math> נבין, כי קיימת אצלנו בעיית אי רציפות ב <math>z=0</math>. נפעיל את תנאי השפה של השדה החשמלי עבור החלק המאונך: <math display="block">\hat z (\epsilon_0 \frac{\eta_0}{2\epsilon_0} \hat z - \epsilon_0 \frac{\eta_0}{2\epsilon_0} (-\hat z)) = \hat z \cdot \frac{2 \epsilon_0 \eta_0}{2 \epsilon_0}\hat z = \hat z \cdot \hat z \eta_0 = \eta_0</math> אכן קיבלנו את <math>\eta_0</math> כצפוי.
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